performance torque toothed wheels

[GIAMMA87]

Good evening,
Could someone tell me the formula to calculate the performance of a pair of toothed wheels? on the web I found some formulas but unfortunately without bibliography and without an exhaustive explanation.
Thank you very much

 

[volaff]

try to see volumes ofkhk gears

 

[meccanicamg]

in this forum I have already talked about it and I have already reported the formula that it uses for the performance of gears.the friction coefficient between the teeth depends on the surface finish of the teeth and the type of lubrication. normally k=0,5 but salt if there are aggravating agents such as oil contamination or losses over time or other factors. in fact in the use of gears for medium heavy sector k=1.
Grinded and well-lubricated gears can have friction coefficient f=0,03÷0,07.

 

[exxon]

normally k=1 but drops if there are any aggravating ones such as oil contamination or losses over time or other factors.

if k falls, the performance increases: I think there's a relapse.
can you clarify when using + or - within brackets?

 

[meccanicamg]

the + sign is used with external gears while the - is used for internal toothing gears.

 

[Giag]

what is the best lubrication type to get low f? gears are completely immersed in oil, it serves a forced lubrication system. . .

 

[stevie]

what is the best lubrication type to get low f? gears are completely immersed in oil, it serves a forced lubrication system. . .

the full immersion involves a viscous friction, the optimal lubrication is that localized in the area of ingraination

 

[Giag]

the gears of my reducer should operate at periphery speeds less than 5m/s: in my case, of limit lubrication, the fat I use is to be understood "to life"? I can simultaneously use a forced lubrication system with nozzles directly on the locations of ungrazing and oils very viscous/fats with lead, metals,...?

 

[TETRASTORE]

the gears of my reducer should operate at periphery speeds less than 5m/s: in my case, of limit lubrication, the fat I use is to be understood "to life"? I can simultaneously use a forced lubrication system with nozzles directly on the locations of ungrazing and oils very viscous/fats with lead, metals,...?

I doubt that you have been entrusted with the study of a large reducer for which a forced lubrication projected directly on the teeth of the gears is necessary, but if I am mistaken to correct me and examine that possibility.
in most small and medium power series industrial gearboxes, the cheapest system is that of oil bath lubrication projected to beat the interested parties.
for more information about this type of lubrication you can consult This document from p. 85 p. 103 in cad3d resources.
I also attach some tables that illustrate the types of lubricants recommended by a manufacturer of gearboxes for its products, of course it must be defined viscosity according to environmental and operational conditions.
small gearboxes are generally supplied complete with synthetic oil and do not require either rhabble or replacement throughout their lifetime; In this case it can be considered a "long life" lubrication and on the groups only a cap for the first filling is provided (in some cases it can be absent and the oil is placed to the assembly).

 

[meccanicamg]

what is the best lubrication type to get low f? gears are completely immersed in oil, it serves a forced lubrication system. . .

Bye. I saw you're a student and you're probably doing a year's project for college.
to have a low friction coefficient you have to work on tooth roughness which must be very low. rectifying you have a well defined surface compared to the simple cut with creator and therefore you already have a starting parameter.

other thing is the type of lubricant. if you can create a thin and pressure-resistant lubricant veil you have already decreased the friction coefficient. if the lubricant is missing, in general, besides not taking away the heat, it starts to make the tooth engraved and to use it prematurely.

the temperature affects because if the lubricant is too hot it slips away and does not book.

on the three-volume niemann, there is the treatment of lubrication and can give you all the information you need to determine type, quantity and mode.

The basic table is this:
therefore for peripheral speed up to 5m/s you opt for the application of a sprayed fluid fat.
certainly in practical use, I can tell you that you do first, on big gearboxes to put us in the oil iso vg 220 or 320 and its beautiful pump of 150€.

the above table indicates that the shape of the reducer is open, that is, the gears are not contained in a stagnated tank but only to protect from the eventual projection.

I have a machine made of verse versions, which can be reduced to a 1.5m wide 2m roller and is moved by an unbulloned mounted crown on the side of the roller and a pinion, grease-lubricated with an automatic grease cartridge and a special duck nozzle.

This travels at a speed about like yours. everything works properly and there is no need to do more complicated things.

certainly nobody would forbid to make a stagnated reducer and put oil on it....but I would have oil that could lose from the seals, the discomfort that stains me the product, additional maintenance (empty and fill).

other chart can be this:you can practically use the oil to go with low speeds and even immersion....but we recommend fishing depths to avoid spending unnecessary energy.

 

[Giag]

where can I find the three-volume niemann in pdf?

 

[carlo23]

the niemann is not found anymore, I have already bought it on an ad

 

[carlo23]

hi mechanics mg, I wanted to ask you if you consider checking to grip, a advice I would ask you and this. If I calculated a shift by thermal expansion calculating the skid temperature by self-ignition from the block formula both by point and linear contact, and by a certain coefficient of linear thermal expansion I will multiply it by that temperature calculated with the block and multiplied by the diameter of contact between rolling bodies, for example I would find the shift of thermal expansion that I would compare it with that of elastic contact I know for this thing, what do you think, because by me having applied this theory and getting those parameters mentioned by the budget that I just told you, and keeping them in consideration for the calculation of the tension of herzt, going to make calculation for example for the bearings, the tension of herzt that calculation according to those parameters, finding thus the diameters of the rolling bodies and accarli to choose from the catalogs skf contact Let me know what you think great mechanics mg...

 

[meccanicamg]

after 10 rows without point I stopped reading. I don't understand.
write the formulas and explain them. Thank you.
the check to grip is done to normal.

 

[meccanicamg]

the standard iso/tr 14179-1 speaks of temperature analysis and hot grip. probably could be useful to you and compare it with your method you described, but that you understood only you, or rather, that I did not understand il
surely the blok theory is the best base to determine the grip resistance.

 

[carlo23]

ok mechanics.. as soon as I can attach notes, so they will be known to all to make a good use and verify the goodness of such requirements, then going from the skf catalog and verify the feasibility if the fatigue life of the bearing and identical calculated with herzt thanks to the balance of the remnants, compared to the usual method used to calculate a simple bearing of any type with the dynamic load coefficient. . .

 

[MassiVonWeizen]

write how @alen2323 e trattate The same topic, perhaps you should compare and exchange information; when speaking the same language is easier to understand. among other things you are short-regional and you could also do it in person

 

[@ndreaR]

write how @alen2323 e trattate The same topic, perhaps you should compare and exchange information; when speaking the same language is easier to understand. among other things you are short-regional and you could also do it in person

In my opinion, to speak in person, it is enough that one of them puts himself in front of an ahhaha mirror

 

[carlo23]

write how @alen2323 e trattate The same topic, perhaps you should compare and exchange information; when speaking the same language is easier to understand. among other things you are short-regional and you could also do it in person

 

[Giag]

do you know how to adapt the graphic constructions of the evolving profile of a gear from a basic circumference to a basic flat curve? It is a curiosity that I have always had: building the evolved from a basic circumference is quite easy; but at the moment I found myself, for example, having to roll a gear/circumference on a parable, how would I orientate the teeth on the parable? would change the evolving profile in the teeth of the parable or would I just take a tooth, and to one to one to orientate them according to the curvature, covering the whole parable? Are there any parametric software that does this? in freecad is there a form? In addition, the transmission performance, is calculated equally?